God is the Being. From this classic Thomistic affirmation we study the new way or rising a natural theology as a consequence of the abandonment of mental limit as the method of metaphysics. The mentioned abandonment allows us to think the first principles in their existential character and in their mutual reference. We discover that God's existential character is the first principle of Identity. Thereupon God is studied as Uncaused. We think about the scope of the demonstration of God's existence and we develop the notions of origin, area of the maximum extent and original reservation. Hereby we delineate the architecture of natural theology and its big speculative possibilites.